Explain the purpose of a pull string in conduit installation.

The purpose of a pull string in conduit installation is primarily to assist in pulling wires through long conduit runs. This is particularly important in situations where the conduit is extensive or has multiple bends and turns, making the process of threading wires through it challenging. The pull string, which is typically a strong cord or rope threaded through the conduit prior to wire installation, serves as a means to guide the wires through smoothly. By attaching the wires to the pull string, installers can easily draw the wires through the conduit without the risk of damaging them or getting them stuck.

Using a pull string increases efficiency and decreases the likelihood of complications during wire installation, particularly in complex or lengthy setups, thereby ensuring that the electrical systems are installed correctly and safely.